Hi Morris:
The GR 631 StroboTac includes a power line driven vibrating reed sticking into the reflector and so it's motion is
stopped by the strobe.
The patent has hand written comments regarding that idea.
http://www.prc68.com/I/GRstrobotac.html#2331317
http://www.prc68.com/I/Images/Strobotac6
Hi
> On Mar 17, 2017, at 7:41 PM, Morris Odell wrote:
>
> HI all,
>
> Thanks to all those who responded to my post and also for the great pics of
> other tuning forks. It's amazing that they were still being used for
> electronic purposes as recently as the 1960s.
Motorola was still very muc
In message <20170317220437.4a4ff406...@ip-64-139-1-69.sjc.megapath.net>, Hal
Murray writes:
>
>e...@scace.org said:
>>Frequencies around 15 Hz were common on early 20th century cables,
>> depending on the degree of success in compensating for the inherent
>> capacitance on a cable tho
HI all,
Thanks to all those who responded to my post and also for the great pics of
other tuning forks. It's amazing that they were still being used for
electronic purposes as recently as the 1960s. Actually now that I think
about it I have seen little tuning forks used to check the function of
mo
Don't forget, seawater is the return path...
> On Mar 17, 2017, at 18:04, Hal Murray wrote:
>
>
> e...@scace.org said:
>> Frequencies around 15 Hz were common on early 20th century cables,
>> depending on the degree of success in compensating for the inherent
>> capacitance on a cable thousa
e...@scace.org said:
>Frequencies around 15 Hz were common on early 20th century cables,
> depending on the degree of success in compensating for the inherent
> capacitance on a cable thousands of miles long surrounded by conductive
> sea water.
Is the sea water relevant?
Does enough energy
-requ...@febo.com wrote:
Message: 8
Date: Fri, 17 Mar 2017 01:34:39 +0100 (CET)
From: "iov...@inwind.it"
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] Antique precision timing device without
electronics
Message-ID:
<1660573894.5853221489710
In message <338b9eed-8664-3876-afdf-610abc420...@irtelemetrics.com>, Dan
Kemppainen writes:
>What the lowest frequency tuning fork oscillator ever built? Was 1Hz
>ever achieved commercially?
Does flagpoles count ? :-)
--
Poul-Henning Kamp | UNIX since Zilog Zeus 3.20
p...@free
00 PM, time-nuts-requ...@febo.com wrote:
Message: 8
Date: Fri, 17 Mar 2017 01:34:39 +0100 (CET)
From: "iov...@inwind.it"
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] Antique precision timing device without
electro
My great, great uncle, longtime design engineer for Guglielmo Marconi had a
tuning fork arrangement of the type discussed here that was enclosed in an
evacuated glass cylinder. I have no idea for what purpose it was used or
what happened to it when he died.
On Friday, March 17, 2017, Poul-Henning
In message , Eric Scace writes:
> Frequencies around 15 Hz were common on early 20th century cables,
>depending on the degree of success in compensating for the inherent
>capacitance on a cable thousands of miles long surrounded by conductive
>sea water. Cable compensation is an enti
; fork.
>
> Did it come with instructions for setting the weights at the end of the
> fork tines?
>
> Best regards,
> Bill Hawkins
>
> -Original Message-
> From: time-nuts [mailto:time-nuts-boun...@febo.com] On Behalf Of Morris
> Odell
> Sent: Thursday, March
In message <160EF818076B4D03A0C067ED273D980B@system072>, "Bill Hawkins" writes:
>Conservation of power says some must be taken from the fork to operate
>the contacts.
Electromagnetic induction could give plenty energy for that, given the
size and heft of the tuning fork.
--
Poul-Hennin
On British submarine telegraph cable systems, repeater stations and
receiving sites employed tuning forks. Repeater sites were at cable traffic
junctions or islands; e.g., Ascension and St Helena Islands in the Atlantic,
Cocos Keeling in the Indian Ocean, Norfolk Island (junction) and Fanning
-Original Message-
From: time-nuts [mailto:time-nuts-boun...@febo.com] On Behalf Of Bill
Hawkins
Sent: Thursday, March 16, 2017 1:05 PM
To: 'Discussion of precise time and frequency measurement'
Subject: Re: [time-nuts] Antique precision timing device without
electronics
Hi Morr
Mike Seguin"
>Data: 16/03/2017 22.33
>A: "Discussion of precise time and frequency measurement"
>Ogg: Re: [time-nuts] Antique precision timing device without electronics
>
>Very interesting use of a tuning fork.
>
>I have only seen this once before. I have the tun
I think Bob Pease of National Semiconductor fame mentioned looking for
the earliest use of phase locked loops and finding a reference to a
European clock maker who had a master pendulum clock with a mechanical
coupling that phase locked newly built clocks when left connected
overnight.
On Thu, 16
est regards,
Bill Hawkins
-Original Message-
From: time-nuts [mailto:time-nuts-boun...@febo.com] On Behalf Of Morris
Odell
Sent: Thursday, March 16, 2017 4:23 AM
To: time-nuts@febo.com
Subject: [time-nuts] Antique precision timing device without electronics
Hi all,
I was recently asked to resurrect t
Very cool!
Thanks for sharing.
You could probably use any of the large vintage neon bulbs to replace the
missing lamp.
Cheers,
Corby
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For the bulb you can probably replace it with a W1A or AR-1bulb which is an
argon bulb commonly used in old school contact printers they have a purple hue
and also emit long wave UV light
I doubt if they are still manufactured but a photo shop or studio or chemist
shop which developed film w
th instructions for setting the weights at the end of the
fork tines?
Best regards,
Bill Hawkins
-Original Message-
From: time-nuts [mailto:time-nuts-boun...@febo.com] On Behalf Of Morris
Odell
Sent: Thursday, March 16, 2017 4:23 AM
To: time-nuts@febo.com
Subject: [time-nuts] Antique p
Hi all,
I was recently asked to resurrect this interesting device by a colleague who
collects antique scientific instruments. It’s a "Chronoscope" made by the H.
Tinsley company in London in the early 20th century and used to measure time
intervals with the precision of those days. It's large a
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